Analytical expressions for preliminary design of dissipative bracing systems in steel frames

Abstract In this paper a direct displacement-based design (DDBD) method for seismic design of steel frames equipped with dissipative braces is proposed. Attention is focused on concentric braced steel frames with pinned beam-to-column joints in which the bracing system (with viscoelastic or elastoplastic dissipative devices) is the main seismic resistant component. The proposed design method uses an equivalent continuous model where flexural deformability and shear deformability are related respectively to columns and diagonals of the bracing system. In this way, analytical expressions of the required flexural and shear stiffness distributions are obtained. These expressions are quite simple and can be conveniently used in preliminary design of dissipative diagonal braces and columns. Examples are shown for steel frames with dissipative braces based on elastomeric dampers (viscoelastic devices) and steel frames with buckling-restrained braces (elastoplastic devices). Results of time history analyses are illustrated and discussed in order to evaluate the effectiveness of the proposed DDBD procedure.

[1]  T. T. Soong,et al.  Supplemental energy dissipation: state-of-the-art and state-of-the- practice , 2002 .

[2]  Vitelmo V. Bertero,et al.  Earthquake Engineering: From Engineering Seismology To Performance-Based Engineering , 2020 .

[3]  Andrew S. Whittaker,et al.  Validation of the 2000 NEHRP Provisions’ Equivalent Lateral Force and Modal Analysis Procedures for Buildings with Damping Systems , 2003 .

[4]  Stephen A. Mahin,et al.  Seismic demands on steel braced frame buildings with buckling-restrained braces , 2003 .

[5]  Andrea Dall'Asta,et al.  Experimental tests and analytical model of high damping rubber dissipating devices , 2006 .

[6]  Gian Michele,et al.  Direct Displacement-Based Seismic Design of Structures , 2007 .

[7]  Peter Fajfar,et al.  Capacity spectrum method based on inelastic demand spectra , 1999 .

[8]  Kazuhiko Kasai,et al.  Passive Control Systems for Seismic Damage Mitigation , 1998 .

[9]  J. Douglas,et al.  Internet site for European strong-motion data , 2004 .

[10]  Gaetano Della Corte,et al.  Development of a Displacement-Based Design Method for Steel Dual Systems With Buckling-Restrained Braces and Moment-Resisting Frames , 2010 .

[11]  Joel P. Conte,et al.  Nonlinear Seismic Response Analysis of Steel–Concrete Composite Frames , 2008 .

[12]  Iunio Iervolino,et al.  REXEL: computer aided record selection for code-based seismic structural analysis , 2010 .

[13]  Andrea Dall'Asta,et al.  HDR devices for the seismic protection of frame structures: Experimental results and numerical simulations , 2009 .

[14]  James M. Ricles,et al.  Performance-Based Seismic Design of Steel MRFs with Elastomeric Dampers , 2009 .

[15]  Masayoshi Nakashima,et al.  Steel Buckling-Restrained Braced Frames , 2004 .

[16]  Chia-Ming Uang,et al.  Reducing residual drift of buckling-restrained braced frames as a dual system , 2006 .

[17]  T. T. Soong,et al.  Passive Energy Dissipation Systems in Structural Engineering , 1997 .

[18]  James M. Ricles,et al.  Experimental Evaluation of a Large-Scale Buckling-Restrained Braced Frame , 2007 .

[19]  Andrew S. Whittaker,et al.  Energy dissipation systems for seismic applications: Current practice and recent developments , 2008 .

[20]  Anil K. Chopra,et al.  Dynamics of Structures: Theory and Applications to Earthquake Engineering , 1995 .

[21]  J. S. Hwang,et al.  Direct displacement-based design for building with passive energy dissipation systems , 2003 .

[22]  James M. Ricles,et al.  Simplified design procedure for frame buildings with viscoelastic or elastomeric structural dampers , 2005 .

[23]  Mervyn J. Kowalsky,et al.  Displacement-based seismic design of structures , 2007 .

[24]  Andrew S. Whittaker,et al.  Equivalent Lateral Force and Modal Analysis Procedures of the 2000 NEHRP Provisions for Buildings with Damping Systems , 2003 .

[25]  Larry Alan Fahnestock,et al.  Buckling-restrained braced frame connection performance , 2010 .

[26]  K. Bathe.  Finite Element Procedures , 1995 .

[27]  Stephen P. Timoshenko,et al.  Vibration problems in engineering , 1928 .

[28]  R. Giacchetti,et al.  Steel dissipating braces for upgrading existing building frames , 2004 .

[29]  Vitelmo V. Bertero,et al.  Seismic Energy Dissipation Systems for Buildings , 2004 .

[30]  Andrea Dall'Asta,et al.  Dynamic systems with high damping rubber: Nonlinear behaviour and linear approximation , 2008 .

[31]  Jinkoo Kim,et al.  Seismic design of low-rise steel frames with buckling-restrained braces , 2004 .

[32]  William T. Holmes,et al.  The 1997 NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures , 2000 .